Lifting-magnet



F.- i. PARKER. LIFHNG MAGNET.

APPLICATION FILED HB. 24, i910. REM-:WED OCT. 8, l9l9. 1,334,504.

Patented Mar. 23, 1920.

2 SHEETSTSHEET I.

F. PARKER. umm; MAGNET. 1,334,504.

APPLICATION FILED FEB. 24. ISH). RENEWED OCT. B. |9|9| PatentedMar.2`3,1920.

2 SHEETS-SHEET 2.

M k@ 64.4.. ma?

is placed in the magnet frame it forms a part of the magnetic circuit,thus increasing the space efficiency. The tubular member (i performs twofunctions. It constitutes a support for the energizing winding and itforms a part of the magnetic circuit and of the inner pole piece of thema net.

The winding 13 may be of any esred construction but preferably a windingis emplo ed of the general construction isclosed 1n atent No. 1,325,914,patented December 23, 1919. Briefiy described, such a winding is formedof a plurality of sections 14, each section comprisin a flat strip ofconducting material wound at-wise into a spiral with a strip ofinsulating material inter osed between thv convolutions thereof. hesections are then b'uilt`u one upon another with suitable layers ofinsulating material 15, interposed between the same, and then theterminals of adjacent coils are connected to form one continuouswinding.

With the structure illustrated, the wind-- ing may be initiall formedupon the tubu lar 'member 6. hen the winding is so formed, one or morelayers of suitable insulating material 16 should first be placed aroundsaid tubular member, after which the conducting strips may be coiledthereon. In practice, to secure thorough insulation of the winding, itis desirable to flange the ends 'of the insulation placed on the tubularmember so that the saine will be overlapped by the layers of insulationplaced over the outside of the winding. In order to prevent bulging ofthe outside layers of insulation by theV fianged ends of the insulation16, I preferably` reduce the width of the inner turns of the top andbottom sections of the winding to accommodate said ianged ends. Thisenables the plate 7 to be placed closely against the upper side of thewinding, thereby avoiding any waste space. One of the advantages ofmaking the plate 7 detachable is to give access to the upper sideiof'the Winding for inspection, repairs, etc., without necessitating theremoval of said winding from the tubular member (i. The

Winding, the tubular member 6 and the' plate 7, in effect, .form aunitary structure which, when the magnet frame is inverted, maybereadily inserted into and withdrawn from the same. 0f course, inpractice, the winding support may be of other constructions and stillform a part of the magnet frame.

The winding and its support may be secured in the magnet frame in anypreferred manner. In practice, howewer, I prefer to place on theunderside of the wirftlinp; an annular non-magnetic protecting or coverplate 18 and to.I provide removable pole shoes. 19 and 20 for retainingthe win( ing support and protecting plate 13 in place. These pole shoesare made of magnetic material and thus form a part of the magneticcircuit. They project some distance below the winding so as to take theblows from the attracted material. Such material will in variably strikethe ole shoes first, and thus the cover plate an winding are protected.The pole shoes being removable may be easily replaced when they becomeworn. This structure provides ample protection for the winding withoutdecreasing the lifting power of the magnet. It is more specificallydescribed and claimed in Patent No. 1,325,914, hereinbefore referred to.The outer pole piece 3 of the magnet frame and tubular n'iember 6 arepreferably provided with annular recesses 21 and 22, respectively whichfurnish shoulders for supporting the protecting plate 18 to prevent thesame from unduly pressing against the winding and to prevent slippingthereof. The inner pole shoe 19 is arranged to overlap both the tubularmember 6 and the protecting plate 1 and is preferably retained in placeby means of bolts 23, passing through the inner pole. At its outereriphcry the protecting )late is preferab y provided with an annui-arflange 24, the end of which is adapted torest upon the outer pole shoe20. VThe outer pole shoe 20 may be secured to the magnet frame in anydesired manner by means of through bolts 25. IVth this arrangement thepole shoes 19 and 2O may be readily removed, thereby permitting thewithdrawal of the cover plate 18 and winding Asupport from the magnetframe. In practice, it is desirable to render the winding moisture proofand to this end I preferably insert suitable annular packings 27, 28 and29 in the joints between the protecting plate 18. the magnet frame andthe tubular member Any desired material may be employed i'or thesepackings.

Upon the plate 7 I secure a terminal block 30 arranged to project intoan opening 31 in the magnet frame. This terminal block may be of anydesired construction, but, in practice, I prefer to construct the samein theI manner illustrated in Fi r. 5. As illustrated, the block 30comprises a ase 32 and a top plate 33. The base 32 is provided withrecesses 34 and'35 arranged to` receive the ends of the leads 41 and 42from the energizing winding, the leads being preferably reflexed thereinas illustrated in Fig. 1. The top plate 33 carries suitable. bindingposts 31' and 37 arranged to project into the recesses 34 and 35 and tobe con nected to the leads 41 and 42. F or retaining the terminal blockin place, I rivet to the plate 7 notches base 32.

3!) provided at the corners of the These studs holds the base 32 againstany laterali-or longitudinal movemen The studs are tapped to receivefastening screws 4,0. passing through the top four studs 38 arranged tofi-t into plate \Vith this arrangement, when the top plate is secured tothestuds 38, it tirml y holds the base 32 in position.

The binding posts 36 and 37 are arranged to be connected by suitableconducting stri s 43 to binding posts 44 and 45 respective secured tothe magnet frame. The bindmg posts 44 and 45 may be of any preferredconstruction. These binding posts are preferably insulated from themagnet frame by means of suitable insulating sleeves 46 and insulatingdisks` 47 and are connected to the supply leads 48.

For giving access to the inner ends of the binding posts 44 and 45 andto the terminal block 30, I provide the magnet frame with a removableplate 49 which may be held in place by screws or any other suitablemeans. A packing 49 is preferably' inserted between the plate 49 and themagnet frame to form an air tight joint. Upon removal of this late, thebinding posts of' the terminal olock 30 and the binding posts carriedby` the magnet frame may be connected and disconnected at will while theenergizing winding is in place ir. the magnet frame. Also upon removalof plate 49 the top of the terminal block 3() may be withdrawn to giveaccess to the ends of the leads 41 and 42 from the winding 13. It willthus be seen that by reexing the ends of the leads 41 and 42 in theterminal block, the plate cari-ying the binding posts 36 and 37 may bewithdrawn through the opening in the 4magnet frame to enable inspectionor renewal of the connections between said leads and said binding posts.

Magnets of this type are often very roughly handled with thel resultthat the connections between the supply leads and the exterior bindingf"osts become loosened, or the supply leads ecome injured. To more fullyprotect the supply leads, I preferably incase the same in a metallicallyreinforced tube or sleeve 50, and, to prevent undue strain on theconnections 'between said leads and the binding posts, I preferablyclamp the protecting tube 50 against the magnet frame. To `this end, Iprovide on the removable plate 49 a raised portion 51 having a curvedrecess 52 therein for receiving the protecting tube 50 of the supplyterminals, and then place over said tube a clamping member 53 havingscrews 54 passing therethrough and fitting into the plate 49, as bestillustrated in Figs. 2, 3 and 4.

It will thus be seen that this clamping arrangement eiiectuallv preventsany strain being exer'ted upon the connections between the leads 48 andtheir binding posts. To facilitate the connections of the leads to theirbinding posts` it. is desirable to have the ends thereof extend beyondthe end of `the protecting casing 50, and I, therefore,

prefer to provide means for protecting the exposed ends of th. se.leads. To thisl end l preferably provide the clamping member 5&5 with adownwardly curved estension 55 ada ted to form a protecting plate t'orsaid lea s. The extension 55 is provided at' its end with an angularlydisposed portion adapted to be clamped to the magnet frame by means ofbolts 56. To still further protect the outside terminal structure, Iprefcr ably rovide the magnet frame on opposite sldcs thereof withupwardly extending flanges :37 and 58 which, in practice, I prefer tohave project slightly above the clamping member 53. The flanges 57 rand58 cooperate with the extension on the clamping p ate 53 to completelyinclose the binding posts 44 and 45 and the ends of the leads 4S, thusinsuring thorough protection thereof. The clamping plate 53, however,may be renioved at any time to give access to the binding posts 47 and48.

l`n my Patent No. 1,270,969, granted July 2, 1918, I have disclosed asimplified method or process of sealing the energizing winding with asuitable protecting matorral, using the magnet frame as the sealingreceptacle. To carry out this method or process, it is necessary thatthe magnet frame be rendered substantially air tight, that suitableopenings be provided in the same to permit the withdrawal o1 air and theinsertion of protecting material, and that suitable passages or spacesbe provided between the magnet frame and the winding for insuringwithdrawal of air from all parts of the frame and a thoroughdistribution of the sealing materia] over the winding. The packingsheretofore described render the magnet frame illustrated sutiicicntlyair tight for carrying out my process of sealing. I have found, inpractice, that with the structure illustrated a thorough distribution ofthe sealing material may be obtained byproviding in the magnet frame twoor more channels or grooves 59 and coincident notches 60 in the outerperiphery of the plate 7 as illustrated in dotted lilies Fig. 1. As manyoi these grooves may be provided as desired. but. in practice. I havefound that two are suliicient. In case only two grooves are used, Iprefer to space these grooves approximately degrees from the recessedportion of the magnet frame which accon'nnodates the leads 41 and 42 ofthe winding and which, in effect, forms a third channel or groove forfacilitating the distribution of the sealing material. In'practice, Irovide the magnet frame with two openings (il shown in dotted lines,each of which com`|uunicates with one of the grooves 59. The openings 61 Vwhile not so shown are in practice preferably screw threaded toreceive suiv able screw threaded plugs or tllelike. In brief` theprocess of sealing is as follows: .\u` air pump is connected to `one lsoof the openings 61, while the `other opening is connected to areceptacle containing the sealin material in a liquid form, a suit-ableva ve being interposed between the magnet trame and said receptacle. Thesupply of sealing material is first shut olf and then the Ypump operatedto create a vacuum within the magnet frame. After this the valvecontrolling the supply of sealing material is opened, whereupon thesealing material is drawn into the magnet trame and thoroughlydistributed over the Winding and into any crevices therein. The inflowof scaling material is continued until the magnet frame is full, orsubstantially full, whereupon the pump is caused to operate to compressthe sealin material in the Jframe. Further details of t le process ofsealing` are disclosed in my Patent No. 1,270,969, granted July 2, 1918,above mentioned.

It is to be understood that thc structure shown is for purposes ofillustration only and that variations may be made therein withoutdeparting from the spirit and scope of the invention as defined by theappended claims.

Having thus described my invention` what 1 claim as new and desire tosecure by Letters Patent, is

1. A liftingr magnet having a 'trame provided with an inner polesurrounded by an outer pole, a remo *able member ot magnetic materialsurrounding the inner pole and formingr part of the magnetic circuit.and an energizing winding' carried by said removable member.

2. A lifting magnet having a trame provided with an inner polesurrounded by an outer pole with an annular recess between said poles, aremovable tubular member of magnetic material surrounding the inner poleand in magnetic contact therewith, and an energizing winding carried bysaid niember and arranged in said recess.

3. A lifting magnet having a frame provided with an inner pole piecesurrounded by au outer .pole piece, a removable tubular member ot'magnetic material surroumlingr the inner pole` piece and in magneticcontact therewith, an energizing winding carried by said member. and a`removable, pole shoe ot' magnetic material on the inner pole pieceadapted to hold said member and winding in position.

4. A lifting magnet having a trame pro vided with an inner pole )ieeesurrounded by an outer polc piece wit an annular recess between saidpole pieces, a removable tubular member ot' magnetic material surrounding thil inner pole piece and in mag netic contact therewith` sa idmember carrying an energizing` winding adapted to be positioned in Isaidrecess, a non-magnetic plate covering said recess, and removable poleshoes of magnetic material on the outer faces of said pole piecesadapted to support said plate and said member.

5. A lifting magnet having a frame provided with an inner and an outerpole piece with a winding space between the same, a tubular ma eticmember removably mount` ed on the inner pole piece, an energizingWindingcarried by said tubular member, removable covering plates forsaid Winding at opposite ends of said tubular member, and removable poleshoes of magnetic material on the outer faces of said pole pieces, saidsboesbeing adapted to hold said tubular member and one of said plates inposition.

6. A lifting magnet having a frame provided with an inner and an outerpole piece with an annular Winding space between the same, removablepole shoes of magnetic ma.- terial on the outer faces of said polepieces, a removable tubular magnetic member surrounding said inner polepiece and forming a part of the magnetic circuit and carrying anenergizing winding arranged in said recess, said pole shoes beingadapted to support said member and Winding in said recess.

7. A lifting magnet having a frame provided with a continuous recess inone face thereof, an energizing winding arranged in said recess, amagnetic member upon which said winding is wound, said member beingremovabl)7 mounted in said frame and forming a part of the magneticcircuit thereof, and removable pole shoes of magnetic material for saidframe adapted to hold said member and winding in place.

8. A lifting magnet having a frame provided with an inner pole piecesurrounded by an annular outer pole piece, a tubular magnetic memberremovably mounted on said inner pole piece and forming a portion of themagnetic circuit thereof, said member having an energizing winding Woundthereabout adapted to fit in the recess between said pole pieces andremovable pole shoes of magnetic material on the outer faces of saidpole pieces adapted to hold the member and winding in place.

9. A lifting magnet having a. circular frame. a tubular magnetic memberremovably mounted within said frame, an energizing winding removablewith said tubular member. a plate secured to one end of said tubularmember, and a pin carried by said plate and arranged to fit into arecess 1n said frame to prevent turning` ot' said tubular member.

10. A lifting magnet having a frame provided With inner and outer poleswith a winding space between the same, a tubular magnetic memberremovably mounted on said inner pole and in magnetic contact therewith,an energizing winding coiled around said tubular member, and coveringplates for said Windingr at opposite ends of .said tubular member, theplate at the inner end of said tubular member being secured thereto forsupporting said winding in inverted position ot said magnet frame andboth of said plates being removable from said tubular member to giveaccess to said winding from opposite sides thereof.

11. A lifting magnet having a frame, an energizing winding for saidframe, a magnetic member upon which said winding is wound, said memberforming a portion of the magnetic circuit of said magnet and beingadapted to be inserted in and withdrawn from said frame` and removablepole shoes for said magnet frame adapted to hold said member and saidwinding in place.

12. A lifting magnet having a circular frame provided with an annularouter pole, a circular member arranged to fit within said frame andhaving a cylindrical magnetic portion projecting from the center thereofforming a portion of the magnetic circuit of the magnet, a winding'coiled around the cvlindrical portion of said niembei'` and means forsecuring said member and said winding in said magnet frame.

1?. A lifting magnet having a circular frame provided with an annularouter pole piece, a circular member arranged to fit within said frameand having a magnetic cylindrical portion projecting from the centerthereof forming a portion of the magnetic circuit of said magnet, awinding coiled around the cylindrical portion of said member, ananniilai protecting plate adapted to be placed over the exposed side ofsaid winding` and reiiovablc pole shoes foi` retaining the removrbleparts in place in said frame.

14. A lifting magnet having a circular frame provided with annular innerand outer pole pieces, a` circular plate arranged to fit within theannular recess between the pole pieces and having a tubular magneticmember fitting over the inner pole piece and forming a portion of themagnetic circuit thereof. a winding mounted on said tubular member, anannular protecting plate arranged to close the annular recess in themagnet frame after the winding luis been placed therein, and removablepole shoes for securing said protecting plate and said winding in placein .said magnet frame.

l5. A lifting magnet having a circular frame provided with annular innerand outer pole pieces. fitting into the recess between said pole pieces,a tubular magnetic 'member arranged to lit over the inner pole piece andadapted to form a portion of the magnetic circuit of said magnet, Isaidplate being secured to said tubular member, a winding coiled around saidtubulai member, and a removaybli pole shoe covering the outer faces of`,ucr pole piece and arranged to engage Wilp port said tubular member.

a removable annular plateI 16. A lifting magnet having a circular frameprovided with outer pole pieces, a removable annular plate fitting intothe recess between said pole pieces, a tubular magnetic member arrangedto litover the inner pole piece and forming a portion ot' the magneticcircuit thereof, said plate being secured to said tubular member, awinding coiled around said tubular member, an annular nonmagneticprotecting plate covering the exposed side of said winding, andremovable pole shoesof magnetic material coverin the outer faces of theinner and outer po o pieces and a1"- raiiged to retain the removableparts in positi'on.

17. A lifting magnet having a frame, an energizing winding therefor, aremovable member within said frame arranged to carry said winding, aterminal block carried by said removable member and connected to theterminals of said windinfr, binding posts carried by said frame andextending into the same in proximity with said terminal block, andaremovable plate on said frame for givingaccess to the inner ends of saidbinding posts and said terminal block.

18. A lifting magnet having a frame, a winding Within said frame,binding posts on said magnet frame and connected to said winding, supplybinding posts, and a removable rotecting plate arranged to cover saidbin mg posts and to clamp said supply leads against said magnet frame.

19. A lifting magnet having a, frame provided with a removable portion,an energizing winding carried by said removable portion, a terminaldevice carried b said removable portion and connected to t e terminalsof lsaid winding, and a removable member on said frame for giving accessto said terminal device.

20. A lifting magnet having a frame, an energizing `Winding, a removablemember within said frame and arranrred to carry said winding, a terminalbloc( detachably secured to said removable member, relexed conductorsconnecting said terminal block to the terminals of said winding, and aremovable plate ou said magnet frame for giving' access to said terminalblock and for permitting the withdrawal thereof without withdra wingsaid removable member.

21. lifting magnet having a frame, a winding within said frame,terminals on the outside of said frame, insulated supply leads connectedto said terminals, and a protecting plate for said terminals detachablysecured to said frame and arranged to clamp said leads against saidframe.

22. A lifting magnet provided with a circular frame having annular innerand outer poles, a Winding arranged Within said frame between saidpoles, a protecting plate for annular inner and v leads connected tosaid closing the opening between said poles, and aekings between saidplate und said poles '0r rendering the joints between the sameSubstantially nir tight, Said frame having a. I :nlurnlityl of radialgrooves on the inside thereof, certain of said grooves communieatingwith openings thro-ugh said freine.

23. A lifting magnet having a, frame provided with a circuler pole, awinding coiled around said pole, an insulating sleeve interposed betweensed winding and said pole, Said sleeve having its end flanged, n layerof insulation arranged on seid windin and overlappin the flanged portiono said sleeve, sai winding being formed with an annular pocket forreceiving the flange of said sleeve whereby said layer of insulationwill lie flat against said windin 24. A lifting magnet having a graineprovided with a circular pole, a winding formed of a at strip ofconducting material wound llatwise around said pole, an insulatingsleeve interposed between said pole and said winding, said sleeve havingat its end a flanged portion, a sheet of insulating muterinl arranged onone eide of said winding and overlappingl the {langed portion of Saidsleeve,y :mid winding having its inner turns of reduced width to form unannular groove to receive the flanged portion of Suid sleeve wherebySuid Sheet of insulating material will lie flut against Suid winding.

A lifting magnet having u circular freine, u removable ring of magneticmate-- rial mounted within Said frame I(ind forniing n portion of themagnetic circuit of Said magnet, un energizing winding carried by andremovable with seid ring, and n circular plate arranged on one eide ofsaid Winding and detlelmbly secured to said ring, Said ring projectingthrough n Central opening in seid plate so that the efficiency of themngnotie rireuit ie not impaired by Said plate.

ln witness whereof I lmve hereunto subseribed my naine in the presenceof two wit ness'es. 4

FRANK l. PARKER. \"\'itnesee$:

vFRANK il. l-lUnAnn, C. W'. iVUesow.

